In order to make an electric current flow it is necessary to have

A potential difference

Explanation:

Chargue flows when there is a potential difference between the ends of a conductor. in order to generate a potential difference, it is necessary that the electric charges be under the action of an electric field, so that the necessary force is created for the charges to flow.

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

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